diff options
| author | Yue Hu <huyue2@yulong.com> | 2021-09-14 11:59:15 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-09-23 23:23:04 +0800 |
| commit | c40dd3ca2a45d5bd6e8b3f4ace5cb81493096263 (patch) | |
| tree | 42b0d3ca66044b03167fbc4d7b9dc0004d1dd258 /fs/erofs/zmap.c | |
| parent | d705117ddd724a9d4877e338e4587010ab6a1c62 (diff) | |
erofs: clear compacted_2b if compacted_4b_initial > totalidx
Currently, the whole indexes will only be compacted 4B if
compacted_4b_initial > totalidx. So, the calculated compacted_2b
is worthless for that case. It may waste CPU resources.
No need to update compacted_4b_initial as mkfs since it's used to
fulfill the alignment of the 1st compacted_2b pack and would handle
the case above.
We also need to clarify compacted_4b_end here. It's used for the
last lclusters which aren't fitted in the previous compacted_2b
packs.
Some messages are from Xiang.
Link: https://lore.kernel.org/r/20210914035915.1190-1-zbestahu@gmail.com
Signed-off-by: Yue Hu <huyue2@yulong.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
[ Gao Xiang: it's enough to use "compacted_4b_initial < totalidx". ]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/zmap.c')
| -rw-r--r-- | fs/erofs/zmap.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c index 9fb98d85a3ce..7a6df35fdc91 100644 --- a/fs/erofs/zmap.c +++ b/fs/erofs/zmap.c @@ -369,7 +369,8 @@ static int compacted_load_cluster_from_disk(struct z_erofs_maprecorder *m, if (compacted_4b_initial == 32 / 4) compacted_4b_initial = 0; - if (vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B) + if ((vi->z_advise & Z_EROFS_ADVISE_COMPACTED_2B) && + compacted_4b_initial < totalidx) compacted_2b = rounddown(totalidx - compacted_4b_initial, 16); else compacted_2b = 0; |